/**
 * AdminApplication - part of PerlaGis Architecture
 *
 * Copyright (C) 2010 Ricardo Gonzalez (gomnaz@gmail.com)
 * This program is free software: you can redistribute it and/or modify it under the
 * terms of the GNU General Public License as published by the Free Software
 * Foundation, either version 3 of the License, or (at your option) any later version.
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
 * Public License for more details.
 * You should have received a copy of the GNU General Public License along with
 * this program. If not, see http://www.gnu.org/licenses/
 */
package org.admin.servlets;

import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.admin.controllers.PerlaController;
import org.perla.services.Nodo;

/**
 * Servlet che gestisce le operazioni sui nodi.
 * In base al parametro <code>action</code> può eseguire le seguenti operazioni:
 * <ul>
 * <li><code>list</code>: restituisce la lista dei nodi presenti in Perla</li>
 * <li><code>find</code>: trova le informazioni relative al nodo identificato dal parametro <code>idNodo</code></li>
 * </ul>
 *
 * @author Ricardo Gonzalez
 * @author Eva Gjeci
 */
@WebServlet(name = "NodeActions", urlPatterns = {"/node"})
public class NodeServlet extends HttpServlet {

    /** 
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/xml;charset=UTF-8");
        PrintWriter out = response.getWriter();
        String i = "";
        try {
            String action = request.getParameter("action");
            if (action == null) {
                action = "list";
            }
            if (action.equals("find")) {
                String idNodo = request.getParameter("idNodo");
                for (Nodo n : PerlaController.getNodes()) {
                    if (n.getIdNodo().equals(idNodo)) {
                        i += "<nodo>"
                                + "<alias>" + n.getAlias() + "</alias>"
                                + "<CoordinataX>" + n.getCoorde() + "</CoordinataX>"
                                + "<CoordinataY>" + n.getCoordn() + "</CoordinataY>"
                                + "</nodo>";
                    }

                }
            } else if (action.equals("list")) {
                for (Nodo n : PerlaController.getNodes()) {
                    i += "<node>"
                            + "<id>" + n.getIdNodo() + "</id>"
                            + "<alias>" + n.getAlias() + "</alias>"
                            + "<coorde>" + n.getCoorde() + "</coorde>"
                            + "<coordn>" + n.getCoordn() + "</coordn>"
                            + "</node>";
                }
            }
        } finally {
            out.println("<?xml version=\"1.0\" encoding=\"UTF-8\"?><root>" + i + "</root>");
            out.close();
        }
    }

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /** 
     * Handles the HTTP <code>GET</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /** 
     * Handles the HTTP <code>POST</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /** 
     * Returns a short description of the servlet.
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>
}
